Unveiling the Journey: Exploring the Stages of Emotional Attachment

I have considered emotional connections in relationships for the past few weeks as it is a topic that comes up with almost every couple that I work with.  Along with communication, this is the most common issue that comes up when couples are seeking marital therapy with me. 

It has been well-researched that good communication is a foundation that supports solid emotional connection, but how does the process work? 

What ingredients may be included in creating emotional attachments, and what happens if those steps are skipped or deteriorate over time?